could thunder
Regelmä&szlig;iges Verb: thunder - thundered- thundered

Bestätigung 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
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it could thunder
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-
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it could be thundering
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-
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it could have thundered
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-
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it could have been thundering
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Negation 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
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it couldn't thunder
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-
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it couldn't be thundering
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-
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it couldn't have thundered
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-
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it couldn't have been thundering
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Fragende Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
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could it thunder?
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-
- 	-
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could it be thundering?
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-
- 	-
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could it have thundered?
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-
- 	-
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could it have been thundering?
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Fragende Negation Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
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couldn't it thunder?
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-
- 	-
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couldn't it be thundering?
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-
- 	-
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couldn't it have thundered?
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-
- 	-
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couldn't it have been thundering?
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